Document 4aONYvMJ9bE5pZrbrQX1q4xve

Message From: Lanthier, Darren [dlanthier@westlake.com] Sent: 3/31/2025 8:02:26 PM To: AirAction [AirAction@epa.gov] CC: Szabo, Aaron [Szabo.Aaron@epa.gov]; Tardif, Abigale (Abbie) [Tardif.Abigale@epa.gov ]; Donahue, Sean [donahue.sean@epa.goy]; Dominguez, Alexander [dominguez.alexander@epa.gov ]; Tsirigotis, Peter [Tsirigotis.Peter@epa.goy]; Lassiter, Penny [Lassiter.Penny@epa.gov ]; Lessard, Patrick [Lessard.Patrick@epa.gov ]; Bouchard, Andrew [Bouchard.Andrew@epa.gov ] Subject: Presidential Exemption: NSPS & NESHAP for SOCMI & Group I & II Polymers and Resins Industry - Westlake Chemical OpCo LP & Westlake Styrene LLC Attachments:WLK 2025-002.pdf Caution: This email originated from outside EPA, please exercise additional caution when deciding whether to open attachments or click on provided links. Flag: Follow up To whom it may concern -- Please see attached, a request for Presidential Exemption for Westlake Chemical OpCo LP's & Westlake Styrene LLC's HON-covered facilities at 900 Highway 108, Sulphur, Louisiana 70665 and 1910 Paktank Rd, Sulphur, LA 70665 as by U.S. EPA of the regulated community. As explained in greater detail in the attached letter, Westlake is seeking a Presidential Exemption under the New Source Performance Standards for the Synthetic Organic Chemical Manufacturing Industry and National Emission Standards for Hazardous Air Pollutants for the Synthetic Organic Chemical Manufacturing Industry and Group I & II Polymers and Resins. See 89 FR 42932; May 16, 2024 (HON rule). As Westlake's evaluation of the requirements under the HON rule progresses and we continue to develop our compliance plans, Westlake may have additional detail or more concrete information related to the technical challenges, time required and costs for coming into compliance with the HON rule. Some of that more detailed information may include confidential business information which Westlake would be willing to provide under the appropriate protections for such competitive and trade secret information. Please contact me (Darren Lanthier) at dlanthier@westlake.com should EPA or the President require more detailed information about specific impacts to Westlake's Petrochemical (Ethylene Manufacturing) Complex , Styrene Monomer Production and/or Styrene Marine Terminal Facilities. Thank you for the timely consideration of this request. Darren Lanthier I Manager -- Environmental PE880 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000103-00001 SC_EVERSPLIT0020608 dlanthierewestlake.com (337) 302-8050 Vesttake 3525 Cities Service Hwy, Sulphur, Louisiana 70663 I wvvw.westlake.com Sierra Club FOIA 2025-EPA-04883 ED_018388_00000103-00002 SC_EVERSPLIT0020609